Strix
26.1K

CVE-2022-20849

MEDIUMCVSS 6.1/10EPSS 0.27%

Last modified

CVE-2022-20849 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
0.27%

17.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xr6.5.1
CiscoIos Xr6.5.2
CiscoIos Xr6.5.3
CiscoIos Xr6.5.15
CiscoIos Xr6.6.1
CiscoIos Xr6.6.2
CiscoIos Xr6.6.3
CiscoIos Xr6.6.4
CiscoIos Xr6.6.25
CiscoIos Xr6.7.1
CiscoIos Xr6.7.2
CiscoIos Xr6.7.3
CiscoIos Xr6.7.35
CiscoIos Xr6.8.1
CiscoIos Xr6.8.2
CiscoIos Xr6.9.1
CiscoIos Xr7.0.1
CiscoIos Xr7.0.2
CiscoIos Xr7.0.90
CiscoIos Xr7.1.1
CiscoIos Xr7.1.2
CiscoIos Xr7.1.3
CiscoIos Xr7.1.15
CiscoIos Xr7.1.25
CiscoIos Xr7.2.1
CiscoIos Xr7.2.2
CiscoIos Xr7.3.1
CiscoIos Xr7.3.2
CiscoIos Xr7.3.3
CiscoIos Xr7.3.4
CiscoIos Xr7.4.1
CiscoIos Xr7.4.2
CiscoIos Xr7.5.1

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2022-20849?
A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
How severe is CVE-2022-20849?
CVE-2022-20849 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2022-20849?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-20849?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST